You might want to keep the Q&A book as well. That's extremely helpful also. It'd be good if you went through the Comprehensive Review book first, and then get through a regimented series of questions, as offered in the Q&A book.
Another thing that I found helpful was to not rely on one publisher alone, but buy others, like the Lippincott or Mosby Q&A books, to get more variety, as well as more practice. While they will cover the same topics, i.e. body systems, nursing process, etc, they do so with a different bent. The rationale portion of the Lippincott book was extremely good in really helping me understand the content, while the Saunder's answer's rationale was more focused on strategies, but didn't add as much value in knowledge content as did the Lippincott. Mind you, Lippincott, for all the joy I got from it, is pretty verbose in their rationale. You can get a headache, if you don't segment your day with lots of breaks. But gaining all that knowledge was ah-so-sweet. The Mosby's Q&A book wasn't as helpful in the rationale department, but if you just have extra time to spare, it will be helpful to study with it too. Again, while they delve into the same body systems as all other books, they will have a different bent. By that I mean, in speaking of pediatric related tumor, one book might give you more questions on Wilm's tumor, while another might focus more on say, leukemia or such.
The format of Saunder's Q&A, as well as Incredibly Easy series of Q&A (not their Review) are great, as you will find the answers in the column next to the questions.
I think Kaplan is a great coarse that teaches you good test-taking strategies, but don't always lean on their tips. They do not work 100% of the time, but somehow they teach it to you as tough it was a commandment. Strategies are great when you just don't know the content, and thus you have to arrive at an answer by elimination. So you will need that too. But the best thing is a combination of both - know content, and test-strategy.
Lastly, the folks who write the NCLEX also have an online review of their own - www.learningext.com
. But the site is AWFUL!!! I was embarrased for them, as I found a plethora of mispellings, grammatical errors, and at least one question that did not apply to the answer choices. This made me realize how human (thus flawed) these NCLEX developers are.